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This is a request for the following attributes to be added to cache entries, as part of their details/metadata:

md5sum: MD5 sum of the data, that is hashlib.md5(str(entry.value)).hexdigest(). Useful to generate and ETag header at the service.

last_modified: HTTP-date version of last_write but generated once and synchronized as part of the metadata, so it is exactly the same value across the instances. Useful to generate a Last-Modified header at the service. Format is RFC2616 but it could also be stored as a timestamp. There are different ways to generate it. The one I am using right now in the services is this one: